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    ImagickPixel::setHSL

    (PECL imagick 2, PECL imagick 3)

    ImagickPixel::setHSL — Sets the normalized HSL color

    说明

    public ImagickPixel::setHSL(float $hue, float $saturation, float $luminosity): bool

    Sets the color described by the ImagickPixel object using normalized values for hue, saturation and luminosity.

    参数

    hue

    The normalized value for hue, described as a fractional arc (between 0 and 1) of the hue circle, where the zero value is red.

    saturation

    The normalized value for saturation, with 1 as full saturation.

    luminosity

    The normalized value for luminosity, on a scale from black at 0 to white at 1, with the full HS value at 0.5 luminosity.

    返回值

    成功时返回 true。

    示例

    示例 #1 Use ImagickPixel::setHSL() to modify a color

    <?php

    //Create an almost pure red color
    $color = new ImagickPixel('rgb(90%, 10%, 10%)');

    //Get it's HSL values
    $colorInfo = $color->getHSL();

    //Rotate the hue by 180 degrees
    $newHue = $colorInfo['hue'] + 0.5;
    if (    $newHue > 1) {
    $newHue = $newHue - 1;
    }

    //Set the ImagickPixel to the new color
    $colorInfo = $color->setHSL($newHue, $colorInfo['saturation'], $colorInfo['luminosity']);

    //Check that the new color is blue/green
    $colorInfo = $color->getcolor();
    print_r($colorInfo);

    ?>

    以上示例会输出：

    Array
(
    [r] => 26
    [g] => 230
    [b] => 230
    [a] => 255
)

    注释

    注意:

    Available with ImageMagick library version 6.2.9 and higher.

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